Q. If the half life of a radioactive sample is $10\ hours$, its mean life is
A) $14.4\ hours$
B) $7.2\ hours$
C) $20\ hours$
D) $6.93\ hours$
Explanation
(a) Mean life $= \frac{Half\ life}{0.6931} = \frac{10}{0.6931} = 14.4\ hours$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.